Hello i'm new on this site thanks admin for accept me. I'm also new on pc engine world.
I bought a duo (as is) in japan and trying to repair.
First i recaped all with console5 smd kit. I cleaned all with isopropyl before recap.
The hu card run well but when i power on the unit without hu card i got a white screen.
Normally i must see system 3 ststem waiting cd and i noticed no life in cd tray no moving lens or motor.
I check the forum and i read via chip can be the fault ? I don't know any help are welcome ! :D
1st thing to check is if both 7805 voltage regulators work. Check with a multi-meter to see if both put out 5V
Hopefully a bad voltage regulator is the problem. If it is not then you either have a bad via hole connection/trace on the board or worst case scenario a bad chip on the board.
ok first i notice changement. I let demo mode hu card run about 5 minute and after power on without hu card menu system CD finally work !
Good but when i let this menu alone it turn back to white some minutes after... and i can notice some glitch artifact sometimes.
here is my results :
(https://i.imgur.com/GqeY08o.jpg)
(https://i.imgur.com/J1NRN1d.jpg)
i take mesure in IN voltage and OUT voltage. Am i good ? as you can see i didn't get 5V at all on both
Well, if it works sometimes then there has to be a bad trace or connection somewhere. Turn on the board and start pushing on the various chips on the board to see if it makes a difference. Could be a cracked solder joint on one of the chips legs.
If that doesn't do anything then I'd check the traces on the bottom of the board for the Hu card slot pins.
Ok thanks keith i will more investigate :o
the quickest way to find this (for me) is to probe the data pins at the slot and the address pins at IC501
with cart out
the IC501 pinout is posted D91317GD
Console Repair/Mod Center => Topic started by: KoSLoW on 07/19/2018, 05:08 PM